:root {
      --primary: #4f46e5;
      --primary-dark: #3730a3;
      --primary-light: #e0e7ff;
      --accent: #f43f5e;
      --accent-warm: #ffedd5;
      --cyan: #06b6d4;
      --amber: #f59e0b;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-base: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --border-color: #e2e8f0;
      --border-accent: #cbd5e1;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(79, 70, 229, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.04);
      --max-width: 1240px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--accent);
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-group {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .brand-group .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }
    .brand-text {
      font-size: 1.35rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .brand-badge {
      font-size: 0.72rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--accent), #e11d48);
      color: #ffffff;
      padding: 2px 8px;
      border-radius: 999px;
      text-transform: uppercase;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 700;
      font-size: 0.95rem;
      padding: 11px 22px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.2;
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #4338ca 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.28);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #4338ca 0%, var(--primary-dark) 100%);
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.38);
    }
    .btn-accent {
      background: linear-gradient(135deg, var(--accent) 0%, #e11d48 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(244, 63, 94, 0.3);
    }
    .btn-accent:hover {
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(244, 63, 94, 0.45);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1.5px solid var(--border-color);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }
    .btn-lg {
      padding: 14px 30px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }

    /* 区域通用样式 */
    .section {
      padding: 72px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-alt);
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 纯代码 Hero 首屏 (无图设计，高视觉冲击撞色) */
    .hero-section {
      padding: 76px 0 84px 0;
      background: radial-gradient(circle at 85% 15%, rgba(244, 63, 94, 0.12) 0%, transparent 45%),
                  radial-gradient(circle at 10% 90%, rgba(79, 70, 229, 0.15) 0%, transparent 50%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.7rem;
      font-weight: 900;
      line-height: 1.22;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -0.8px;
    }
    .hero-content h1 .highlight-text {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }
    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 32px;
    }
    .hero-badge-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 12px;
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .hero-badge-item span {
      color: var(--accent);
      font-weight: 800;
    }
    .hero-btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    
    /* Hero 右侧纯代码架构仪表板卡片 */
    .hero-dashboard {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }
    .hero-dashboard::before {
      content: "";
      position: absolute;
      top: -2px;
      left: 20%;
      right: 20%;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      border-radius: 4px 4px 0 0;
    }
    .dash-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 20px;
    }
    .dash-title {
      font-weight: 800;
      font-size: 1.05rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .dash-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      font-weight: 700;
      color: #10b981;
      background: #ecfdf5;
      padding: 3px 10px;
      border-radius: 999px;
    }
    .dash-status::before {
      content: "";
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
    }
    .dash-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      margin-bottom: 20px;
    }
    .dash-stat-box {
      background: var(--bg-alt);
      padding: 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }
    .dash-stat-label {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 4px;
    }
    .dash-stat-val {
      font-size: 1.35rem;
      font-weight: 900;
      color: var(--primary);
    }
    .dash-model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      padding-top: 8px;
    }
    .dash-tag {
      font-size: 0.76rem;
      font-weight: 700;
      padding: 4px 8px;
      background: #fff1f2;
      color: var(--accent);
      border-radius: 4px;
      border: 1px solid #ffe4e6;
    }

    /* 信任背书与关键数据栏 */
    .metrics-bar {
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 28px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .metric-item {
      padding: 10px;
      border-right: 1px solid var(--border-color);
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.1;
      margin-bottom: 4px;
    }
    .metric-num span {
      color: var(--accent);
    }
    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 平台核心矩阵卡片 (撞色风) */
    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .cards-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1.5px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .card-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 900;
      margin-bottom: 18px;
    }
    .icon-indigo { background: var(--primary-light); color: var(--primary); }
    .icon-rose { background: #ffe4e6; color: var(--accent); }
    .icon-amber { background: #fef3c7; color: #d97706; }
    .icon-cyan { background: #cffafe; color: #0891b2; }

    .card-title {
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .card-footer-tag {
      margin-top: 16px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 4px;
    }

    /* 多模型生态徽章展示 */
    .model-ecosystem-box {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-pill {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
      transition: var(--transition);
    }
    .model-pill:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: scale(1.05);
    }

    /* 步骤流程与工作流 */
    .flow-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-badge {
      font-size: 1.3rem;
      font-weight: 900;
      color: var(--accent);
      margin-bottom: 12px;
      display: block;
    }
    .step-card-title {
      font-size: 1.1rem;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .step-card-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测表格与卡片 */
    .eval-highlight-card {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 36px;
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 30px;
      align-items: center;
    }
    .eval-score-box {
      text-align: center;
      background: rgba(255, 255, 255, 0.08);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .eval-score-num {
      font-size: 3.4rem;
      font-weight: 900;
      color: #fbbf24;
      line-height: 1;
    }
    .eval-stars {
      color: #fbbf24;
      font-size: 1.2rem;
      margin: 8px 0;
    }
    .eval-points-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }
    .eval-point-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.95rem;
      color: #e0e7ff;
    }
    .eval-point-item::before {
      content: "✓";
      color: #34d399;
      font-weight: 900;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .custom-table th {
      background: #f8fafc;
      font-weight: 800;
      color: var(--text-main);
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .custom-table .highlight-col {
      background: #f5f3ff;
      font-weight: 700;
      color: var(--primary);
    }

    /* 真实图文案例展示 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .media-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .media-img-wrapper {
      position: relative;
      width: 100%;
      background: #f1f5f9;
      overflow: hidden;
    }
    .media-img-wrapper img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-img-wrapper img {
      transform: scale(1.04);
    }
    .media-content {
      padding: 22px;
      flex-grow: 1;
    }
    .media-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--accent);
      background: #ffe4e6;
      padding: 3px 8px;
      border-radius: 4px;
      margin-bottom: 10px;
    }

    /* 用户评论区 (6条真实评论) */
    .testimonial-card {
      background: #ffffff;
      border: 1.5px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .testimonial-quote {
      font-size: 0.94rem;
      color: var(--text-main);
      line-height: 1.65;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 14px;
      border-top: 1px solid var(--border-color);
    }
    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--cyan));
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }
    .user-info-name {
      font-size: 0.95rem;
      font-weight: 800;
      color: var(--text-main);
    }
    .user-info-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴面板 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item:hover {
      border-color: var(--primary);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafafa;
    }
    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--accent);
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
    }

    /* 需求匹配与联系我们表单 */
    .form-section-box {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .contact-info-col {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-card-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 24px 0;
    }
    .contact-detail-row {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
    }
    .contact-label {
      font-weight: 700;
      color: var(--text-main);
      min-width: 80px;
    }
    .qr-container {
      background: #f8fafc;
      padding: 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: inline-flex;
      align-items: center;
      gap: 16px;
    }
    .qr-container img {
      width: 100px;
      height: 100px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }
    .custom-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1.5px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-family: inherit;
      color: var(--text-main);
      background: #ffffff;
      transition: var(--transition);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 资讯与动态文章 */
    .article-list-wrap {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .article-item-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .article-pub-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .article-headline {
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .article-headline a:hover {
      color: var(--primary);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 0.9rem;
      border-top: 1px solid #1e293b;
    }
    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 800;
      margin-bottom: 18px;
    }
    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links-list a {
      color: #94a3b8;
    }
    .footer-links-list a:hover {
      color: #ffffff;
    }
    .friend-links-box {
      padding: 20px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }
    .friend-links-box a {
      color: #cbd5e1;
      padding: 3px 10px;
      background: #1e293b;
      border-radius: 4px;
      font-size: 0.82rem;
    }
    .friend-links-box a:hover {
      background: var(--primary);
      color: #ffffff;
    }
    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 悬浮客服面板 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      border: none;
      transition: var(--transition);
      text-decoration: none;
    }
    .float-btn:hover {
      background: var(--accent);
      transform: scale(1.1);
      color: #ffffff;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .cards-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .cards-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .flow-steps-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-grid { grid-template-columns: 1fr; gap: 32px; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
      .metric-item { border-right: none; }
      .eval-highlight-card { grid-template-columns: 1fr; }
      .form-section-box { grid-template-columns: 1fr; }
      .footer-top-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .cards-grid-4, .cards-grid-3, .cards-grid-2, .flow-steps-grid, .article-list-wrap {
        grid-template-columns: 1fr;
      }
      .hero-content h1 { font-size: 2.1rem; }
      .section-title { font-size: 1.7rem; }
      .footer-top-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; text-align: center; }
    }